Portable rubbing and sanding machine.



E. S. SMITH.

PORTABLE RUBBING AND SANDING MACHINE.

APPLICATION FILED JULY 9, 1914.

1 29 233 Patented Dec.22,1914.

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PORTABLE RUBBING AND SANDING MACHINE.

APPLICATION FILED JULY 9, 1914.

1 1 22,330 I Patented Dec. 22, 1914.

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PORTABLE RUBBING AND SANDING MACHINE.

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To all whom it may concern: 7

Be it known that I, EDMUND S. SMITH, a citizen of the United States,residing at the city of Jamestown, in the county of Chautauqua and Stateof New York, have invented certain new and useful Improve ments in.Portable Rubbing and Sanding Machines, of which the following, taken inconnection with the accompanying drawings, is a specification. V

The invention relates to portable machines for rubbing, sand papering orpolishing; and the improvement consists in providing a simple, strongand easily handled portable sanding or polishing machine which has adirect drive on the rubbing blocks in giving a reciprocating motionthereto and one which can not easily get out of order; and the inventionconsists of the novel features and combinations hereinafter set forthand claimed. w

In the drawings, Figure 1 is a perspective view of the sanding machine,a portion of the casing being broken away to show one of the rubbingblocks in position therein. Fig. 2 is a sectional view at line X X inFig.4, showing the arrangement of the crank wheels and gears, the gearsbeing shown in dotted line; and Fig. 3 is a sectional view' at line Y Yin Fig. 4, showing the arrangement of the gears withthe crank wheelsshown in dotted line. Fig. 41 is an end elevation of the rubbingmachine, showing the relation of the different parts and their positionin the casing. Fig. 5 is a perspective-view of one of the rubbingorsanding blocks with the sliding holder separated the manner ofdetachably connecting these parts. 6 is a detail of one of the crank:wheels'with the crank arm attached thereto.

' Fig. 7 is a side elevation of the holding spring. for thereciprocating block.

Like numerals of referencerefer to corre-.

sponding parts in the. several views. 1.

for the crank wheels 15 and rubbing blocks 22. Suitable journals areprovided for the shafts 16 ofthe gears/13 and 14:, which shafts alsosupport the crank wheels 15 on their lower ends. The two shafts. 16 areplaced spaced distances from a central shaft 17 and smallgear 14 whichis keyed thereon Specification of Letters Patent.

The numeral 10 designates the casing which is preferably made of castmetal and has the upper compartmentll for the gears 13 and 14 and thelower compartment 12.

Patented Dec. 22, 1914:.

Application filed July 9, 1914. Serial No. 849,958.

the small gear 14 meshing in the larger gears 13 at each side, whichlarger gears are keyed on the shafts 16, the .three gears being slippedinto the end of the compartment 11 of the casing 10 and the shafts l6and 17 lnserted through them in assembling the parts. The crank wheels15 first have the crank arms 18 pivotally attached thereto on suitablewrists 19 and then are slipped into the end of the compartment 12 andattached to the lower ends of the shafts 16 s9 that said crank wheelsare turned by said shafts.

The horizontal grooves 20 are provided on theopposite inner sides ofthecasing 10 in the. lower portion of the compartment 12 to slidablyreceive therein the edges of the upper or holder portion 21 of therubbing block 22. The upper portion 21 of the rubbing block is attachedto the lower portion of the block 22 by means of an upward projection 23which is dovetail shaped and slidably fits within the dovetail shapedopening 24: of the under side of the holder 21. A projection 25 isprovided midway of the under side of the holder 21 which fits into aU-shaped bend 26 in a spring 27 attached across the upward projection 23in a groove 28, which arrangement permits the spring 27 to sink into thegroove 28 when the projection 25 enters the bend 26.

The projection 23 holds the rubbing block 22 firmly in line andthespring 27 on the projection 25 interlocks the parts so that they cannot get out of position in their relation to one another. It is apparentthat different forms of rubbing blocks 22 may' -.'protected from dustand dirt by means of sheet metal plates 31 which are attached to thelower edges of the casing 10 at each side an'd the holder 21 is cut awayso as to leave only a central lengthwise narrow neck or standard 33' inorder to lighten the same. The plates 31 extend. close to each side ofthe standard 33 leaving a single narrow slot 34' central of the machine,thereby protecting the mechanism against sand grit or other forms ofdust and dirt. The holder 21 is attached to the crank arm 18 by means ofa suitable wrist 32, and the rubbing blocks 22 with their holders are soproportioned that a pair of blocks maybe attached one to each .of theshafts 16 to be reciprocally moved by said shafts and the crank wheelsso as to cover the space without interfering 2 thereby turning gears 14and 13 and shafts 16 with crank wheels 15 thereon, thereby reciprocatingthe rubbing blocks by means of crank arms 18. This forms an exceedinglysimple and direct drive which distributes the wear to the two crankshafts 16 and is not'liable to get out of order and yet is exceedinglypowerful, accomplishing the work with the minimum of time and power.

I claim as new:

1. In a rubbing and sanding machine, a casing having upper and lowercompartments therein, three vertical and parallel shafts mounted inspaced double journals in said casing and extending into saidcompartments, the central of said .three shafts extending above saidcasing to form a drive shaft-for the other two shafts, spur gearconnection between the upper ends of said other two shafts and saidcentral driving shaft, crank wheels on the lower ends of said other twoshafts, crank arms on suitable Wrists on said crank wheels, rubbing andsanding blocks slidably mounted in suitable ways in said casing one toeach end, said blocks connected to said crank arms by suitable Wriststothereby move said blocks to and from one another when said crank wheelsare rotated by said shafts. I

2. A machine of the class described comprising a casing having upper andlower compartments, a vertical driving shaft journaled in said casingand extending centrally into said compartments, a gear on said drivingshaft in said upper compartment, vertical crank shafts journaled oneeach side of said driving shaft in said casing andextending into saidupper and lower com-- partments, gears on the upper ends of said crankshafts in said upper compartment meshing in the gear on'said drivingshaft, crank wheels on the lower ends of said crank shafts in said lowercompartment, said lower compartment having sliding ways on the oppositeinner sides thereof, a pair of rubbing or sanding blocks slidablymounted in said sliding ways, a direct crank arm connection between saidcrank wheels and said blocks to reciprocally move said blocks to andfrom one another on said sliding ways, and means for protecting themechanism from the dust and dirt.

3. In a rubbing and sanding machine, a casing having sliding ways on theopposite inner sides of the lower portion thereof, a rubbing or sandingblock slidably mounted in said sliding ways and consisting of an upperportion having a dovetail-shaped opening crosswise of its under side anda downward projection on said under side within said dovetail-shapedopening, a lower portion to said rubbing block having a dovetail-shapedupward projection on its upper side to fit within said dovetail-shapedopening on the under side of said upper portion, a spring on saiddovetail-shaped upward projection of said lower portion, and a crosswisebend in said spring to engage said downward projection on said upperportion within said dovetail-shaped opening to thereby unite said upperand lower portions and hold said lower portion firmly in line.

4. In a rubbing and sanding machine, a movable casing having slidingways on the opposite inner sides of its lower portion, a pair of rubbingor sanding blocks mounted in said sliding ways one to each end of saidcasing, mecha'hism in said casing for reciprocally moving said blocks toand from one another on said sliding ways, said blocks having lengthwiseopenings on the opposite sides thereof extending nearly to the center ofthe casing to form a narrow neck or standard connecting the upper andlower portions of said blocks, and guard plates attached to thelengthwise lower edges of said casing and extending into said lengthwiseopenings to said narrow neck on each side thereof to protect saidmechanism from dust and grit. 1

In testimonywhereof I have aflixed my signature in the presence of twowitnesses.

'EDMUND S. SMITH.

Witnesses:

H. A. SANDBERG, CLAYTON M.- JoNEs.

